Use AST_EXT_TOOL_CHECK() for the GTK check again. I changed this to an inline

implementation to fix a small bug, but after a discussion with rizzo, I went to
change it back.  Also, it turns out that the implementation of the macro already
supported what was needed to fix the problem.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@97767 65c4cc65-6c06-0410-ace0-fbb531ad65f3